Online-Monitoring of Die Forging Processes by Means of Acoustic Emission

• Applicant: Professor Dr.-Ing. Bernd-Arno Behrens
• Subject Area: Primary Shaping and Reshaping Technology, Additive Manufacturing
• Term: from 2007 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 56522233

In the machine and automobile industry forged parts with complex geometries are often produced in serial production. These processes are commonly automated, so the monitoring and early detection of occurring defects of the tool and the product are becoming increasingly necessary. The acoustic emission technique is a non-destructive testing method, which records the released ultrasonic acoustic waves generated by the structural change of the material. The recorded signals get analyzed and evaluated in order to draw conclusions about the condition of the process and / or product.The aim of the proposed research project is the development of an acoustic emission based defect detection system for the online monitoring of hot forging processes. During the first project period an indicator for the detection and classification of forging process events, e. g. cracking and friction, based on a combination of temporal and spectral derived parameters was developed. The objective of the follow-up project is the transfer of the achieved findings about the relation between defects that occur during the forging process and the resulting acoustic emissions to a model geometry that is relevant for the common practice. The focus thereby will be the crack detection.

• DFG Programme: Research Grants